The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 2020
Filed:
Feb. 01, 2018
Landis+gyr Innovations, Inc., Alpharetta, GA (US);
John T. Voisine, Lafayette, IN (US);
Landis+Gyr Innovations, Inc., Alpharetta, GA (US);
Abstract
An arrangement includes an A/D converter and a processing circuit. The A/D converter is configured to generate digital samples of voltage and current waveforms in a polyphase electrical system. The processing circuit is operably coupled to receive the digital samples from the A/D converter. The processing circuit configured is to obtain contemporaneous phase current and voltage samples I, I, Iand/or I, and V, V, V. The processing circuit is further configured to determine source leg current sample values based on three of the current samples of I, I, I, and I, and also based on a ratio of the impedance on one leg of a center-tapped source transformer secondary winding to another secondary winding of a source transformer. The processing circuit is further configured to determine a VA value based at least in part on the source leg current samples. The processing circuit is further configured to provide information representative of the VA calculation to one of a group consisting of a display, a communication circuit, a memory and a billing calculation unit.